Nintendo in Japan has been focusing on producing products for an older generation, including a which puts players through a daily routine of number games, word puzzles, and reading exercises. They were offering the US Version of this, called Brain Age, at the AARP event.
We think the idea of designing computer games for an older generation is a good one. Marketing to them may be a bit harder, but as with many other things, if you feed an untapped market with well-designed, thought-out, and tested products, you will not only be successful financially, but you will be starting a new trend.